There are related effects (like
Warhol or Scrap
Art), but this effect closely follows the pop art style of Roy Lichtenstein.
Here is an example:

The image on the
left is the original, and the image on the right is after the effect has
been applied. To give you an idea of the fine control you have over the
effect here is a screenshot of the dialog box:

As you can see
you have 4 levels and each level can be filled with different patterns
of different stlyles and colors. You can see in the dialog at top left
is called "Dark colors in the original image" and so on. You
can also change the size of the outline, and how much dark areas there
are in the final image.